Reposted, from another users comment, who was ironically, "moderated":

Since MM has a broken system, and are unable to properly advise users of how they may retain / re-edit their levels to make them suitable, I will give an explanation as to how to exploit their broken system.

It's quite simple really.  Always keep a backup of a level before publishing.  Each of the levels that get published are given a unique identifier that links back to your user account and the space it holds on your "My Moon" page.  To circumvent their efforts in destroying hours of your work, simply keep an copy with an unpublished version of the level.

So if you create a "Mario" level, and you want to publish it, copy it to another slot on your My Moon.  Then publish the original level.  If it gets moderated, make a copy of your backup to another slot on your "My Moon" page, and publish the first backup.

Using this method, you can keep a level up indefinitely, since it seems that MM cannot get their act together with this moderation, and people are losing hours and hours of work.

Enjoy. 

why are they being moderated, 4 out of the 5 levels i had posted have been moderated. all of the 5 were from the beta test and have been published since the game came out, there are still other xbox 360 levels out there so why erase mine??? the other 4 are expendable but not that one, it was so popular!

PSN- B_RAN_DO

Great idea.

You can delete levels that have been moderated, right? That way, your moon doesn't have 20 of the same levels.

Cheat the system, for the better.

Kudos!

are there any sinep* levels u can play?

*backwards

Maybe if we keep doing this, they will understand they are just pissing people off by removing the most popular levels for no reasons.

I loved that GOW level, I hearted it (Who Didn't?!?!?!) so why take down what people likes the most?